Hey guys I'm doing a swap on my 04 E55 AMG and the engine I'm putting it apparently has a 84 sc pulley on it and it's tuned. Problem is I can't swap ecu's over so I'm stuck running it on my stock ecu for now. Is that bad ? Should I not run it? Also I was hearing its not a big deal if I run it not tuned because of the size not sure. Thanks in advance.
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